1. Mutation: This is the ultimate source of new genetic variation. Mutations are changes in the DNA sequence, which can occur spontaneously or be induced by environmental factors. These changes can range from single nucleotide substitutions to large-scale chromosomal rearrangements. Some mutations may have no effect, while others can be harmful, beneficial, or neutral.
2. Recombination: This process shuffles existing genetic material during sexual reproduction. When chromosomes from the mother and father combine, they exchange genetic material through crossing over. This results in offspring inheriting unique combinations of genes from their parents, increasing the genetic diversity within a population.
These two processes, working together, are responsible for the wide range of genetic variation observed in populations.
